| 摘要 |
An antenna ( 10 ) having a top ( 14 ), a bottom ( 16 ), and a longitudinal axis ( 20 ). An outer shell ( 12 ) of electrically conductive material is provided which is coaxial with the longitudinal axis, and which includes an outer top wall ( 22 ) joining with an outer side wall ( 24 ) that extends toward the bottom of the antenna. The shell defines an interior region ( 18 ) that is filled with a dielectric material, and the shell has at least one slot ( 30 ) with opposed slot ends. Each slot extends from one opposed slot end in the side wall, and at least partially across the top wall to an opposed other slot end. A coaxial feed ( 32 ) extends from the bottom of the antenna to the top of the antenna, to convey electromagnetic energy to or from the top wall of the antenna.
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